Upper Dam Weather Records (USC00178942)

Record envelope, standing records and threshold days for Upper Dam (USC00178942), Maine, United States, with 66 years of record.

Key Facts for Upper Dam

Upper Dam (USC00178942) is a weather station in Maine, United States at 44.88 latitude and -70.86 longitude, 447 m (1,465 ft) above sea level.
The station reports from 1948 to 2013, 66 years of record.
1,464 records set at Upper Dam still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Upper Dam set a daily record precipitation of 18.3 mm (0.7 in) on 2 November 2013.

About the Station

Location: Maine, United States, 44.88 latitude, -70.86 longitude.
Elevation: 447 m (1,465 ft).
Period of record: 1948 to 2013, 66 years.
Eligible elements: prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Upper Dam. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.

Daily record high and record low at Upper Dam, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	10.0 C (50.0 F)	-29.4 C (-20.9 F)	n/a	n/a
Feb	10.6 C (51.1 F)	-26.7 C (-16.1 F)	n/a	n/a
Mar	25.0 C (77.0 F)	-26.7 C (-16.1 F)	n/a	n/a
Apr	26.7 C (80.1 F)	-13.3 C (8.1 F)	n/a	n/a
May	27.8 C (82.0 F)	-2.2 C (28.0 F)	n/a	n/a
Jun	30.6 C (87.1 F)	2.8 C (37.0 F)	n/a	n/a
Jul	31.1 C (88.0 F)	7.8 C (46.0 F)	n/a	n/a
Aug	29.4 C (84.9 F)	6.7 C (44.1 F)	n/a	n/a
Sep	29.4 C (84.9 F)	0.6 C (33.1 F)	n/a	n/a
Oct	25.0 C (77.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	18.3 C (64.9 F)	-16.1 C (3.0 F)	n/a	n/a
Dec	13.3 C (55.9 F)	-17.8 C (0.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Upper Dam still stand. 2011 holds the most, with 490.

Wettest Day of Each Month

Aug: 112.8 mm (4.4 in)

The wettest day on record for each calendar month at Upper Dam. The most was 112.8 mm (4.4 in) on 29 August 2011.

Record daily precipitation for each month at Upper Dam
Month	Record daily precipitation (mm)	Date
Jan	35.3 mm (1.4 in)	9 January 1956
Feb	55.9 mm (2.2 in)	19 February 1960
Mar	44.7 mm (1.8 in)	7 March 2011
Apr	49.8 mm (2.0 in)	2 April 1970
May	48.5 mm (1.9 in)	28 May 2011
Jun	41.9 mm (1.6 in)	27 June 1954
Jul	48.3 mm (1.9 in)	19 July 1964
Aug	112.8 mm (4.4 in)	29 August 2011
Sep	74.2 mm (2.9 in)	11 September 1954
Oct	48.3 mm (1.9 in)	24 October 1959
Nov	65.0 mm (2.6 in)	26 November 1950
Dec	96.5 mm (3.8 in)	27 December 1969

Period of Record Coverage

1971 to 2013

6 years of record at Upper Dam, 1971 to 2013. 3 years have data for under 90 percent of days and are left out of rankings: 1971, 1972, 1975.

Latest Records

Latest records at Upper Dam
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
2 November 2013	Upper Dam, US	daily rain	18.3 mm (0.7 in)	4.1 mm (0.16 in)	50 years	20 of 100 (Routine)
13 September 2013	Upper Dam, US	daily rain	23.6 mm (0.9 in)	5.3 mm (0.21 in)	52 years	20 of 100 (Routine)
9 August 2013	Upper Dam, US	daily rain	8.4 mm (0.33 in)	2.3 mm (0.09 in)	48 years	20 of 100 (Routine)
2 July 2013	Upper Dam, US	daily rain	26.2 mm (1.0 in)	12.2 mm (0.5 in)	55 years	36 of 100 (Notable)
8 June 2013	Upper Dam, US	daily rain	27.2 mm (1.1 in)	6.9 mm (0.27 in)	42 years	26 of 100 (Routine)
26 May 2013	Upper Dam, US	daily rain	29.7 mm (1.2 in)	10.6 mm (0.4 in)	42 years	32 of 100 (Routine)
22 May 2013	Upper Dam, US	daily rain	33.0 mm (1.3 in)	20.6 mm (0.8 in)	39 years	45 of 100 (Notable)
17 January 2013	Upper Dam, US	daily rain	4.6 mm (0.18 in)	1.6 mm (0.06 in)	51 years	20 of 100 (Routine)

Extremes by Year

1948 to 2013

Yearly extremes at Upper Dam: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	31.1 C (88.0 F)	2013	28.7 C (83.6 F)	6
Coldest night (TNn)	-29.4 C (-20.9 F)	2011	-20.0 C (-4.0 F)	6
Wettest day (Rx1day)	112.8 mm (4.4 in)	2011	38.9 mm (1.5 in)	33
Wettest five days (Rx5day)	141.2 mm (5.6 in)	2011	66.3 mm (2.6 in)	33
Longest dry spell (CDD)	25 days	1961	14 days	33

Hottest day (TXx)

The hottest day of the year at Upper Dam, 1948 to 2013. The record is 31.1 C (88.0 F) in 2013, marked on the chart; the median year is 28.7 C (83.6 F).

Hottest day (TXx) at Upper Dam by year
Year	Hottest day (TXx)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	26.7 C (80.1 F)
1972	13.3 C (55.9 F)
1973	n/a
1974	n/a
1975	18.3 C (64.9 F)
1976	n/a
1977	n/a
2011	30.6 C (87.1 F)
2012	30.6 C (87.1 F)
2013	31.1 C (88.0 F)

Coldest night (TNn)

The coldest night of the year at Upper Dam, 1948 to 2013. The record is -29.4 C (-20.9 F) in 2011, marked on the chart; the median year is -20.0 C (-4.0 F).

Coldest night (TNn) at Upper Dam by year
Year	Coldest night (TNn)
1948	n/a
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	3.3 C (37.9 F)
1972	-13.3 C (8.1 F)
1973	n/a
1974	n/a
1975	-6.7 C (19.9 F)
1976	n/a
1977	n/a
2011	-29.4 C (-20.9 F)
2012	-28.9 C (-20.0 F)
2013	-26.7 C (-16.1 F)

Wettest day (Rx1day)

The wettest day of the year at Upper Dam, 1948 to 2013. The record is 112.8 mm (4.4 in) in 2011, marked on the chart; the median year is 38.9 mm (1.5 in).

Wettest day (Rx1day) at Upper Dam by year
Year	Wettest day (Rx1day)
1948	38.1 mm (1.5 in)
1949	29.7 mm (1.2 in)
1950	65.0 mm (2.6 in)
1951	37.1 mm (1.5 in)
1952	35.6 mm (1.4 in)
1953	35.6 mm (1.4 in)
1954	74.2 mm (2.9 in)
1955	37.8 mm (1.5 in)
1956	35.3 mm (1.4 in)
1957	40.4 mm (1.6 in)
1958	38.4 mm (1.5 in)
1959	48.3 mm (1.9 in)
1960	63.5 mm (2.5 in)
1961	46.5 mm (1.8 in)
1962	38.9 mm (1.5 in)
1963	35.6 mm (1.4 in)
1964	48.3 mm (1.9 in)
1965	32.5 mm (1.3 in)
1966	35.8 mm (1.4 in)
1967	28.4 mm (1.1 in)
1968	39.9 mm (1.6 in)
1969	96.5 mm (3.8 in)
1970	52.6 mm (2.1 in)
1971	34.0 mm (1.3 in)
1972	40.4 mm (1.6 in)
1973	40.4 mm (1.6 in)
1974	41.1 mm (1.6 in)
1975	35.8 mm (1.4 in)
1976	40.6 mm (1.6 in)
1977	23.9 mm (0.9 in)
2011	112.8 mm (4.4 in)
2012	41.4 mm (1.6 in)
2013	34.5 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Upper Dam, 1948 to 2013. The record is 141.2 mm (5.6 in) in 2011, marked on the chart; the median year is 66.3 mm (2.6 in).

Wettest five days (Rx5day) at Upper Dam by year
Year	Wettest five days (Rx5day)
1948	57.7 mm (2.3 in)
1949	84.9 mm (3.3 in)
1950	129.3 mm (5.1 in)
1951	57.4 mm (2.3 in)
1952	62.2 mm (2.4 in)
1953	75.7 mm (3.0 in)
1954	117.4 mm (4.6 in)
1955	54.3 mm (2.1 in)
1956	92.7 mm (3.6 in)
1957	67.1 mm (2.6 in)
1958	60.0 mm (2.4 in)
1959	84.9 mm (3.3 in)
1960	96.5 mm (3.8 in)
1961	50.3 mm (2.0 in)
1962	62.0 mm (2.4 in)
1963	65.0 mm (2.6 in)
1964	66.4 mm (2.6 in)
1965	63.7 mm (2.5 in)
1966	56.9 mm (2.2 in)
1967	34.5 mm (1.4 in)
1968	54.1 mm (2.1 in)
1969	116.6 mm (4.6 in)
1970	59.9 mm (2.4 in)
1971	58.6 mm (2.3 in)
1972	49.7 mm (2.0 in)
1973	80.5 mm (3.2 in)
1974	66.3 mm (2.6 in)
1975	70.1 mm (2.8 in)
1976	71.4 mm (2.8 in)
1977	31.1 mm (1.2 in)
2011	141.2 mm (5.6 in)
2012	86.4 mm (3.4 in)
2013	95.8 mm (3.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Upper Dam, 1948 to 2013. The record is 25 days in 1961, marked on the chart; the median year is 14 days.

Longest dry spell (CDD) at Upper Dam by year
Year	Longest dry spell (CDD)
1948	16 days
1949	12 days
1950	9 days
1951	16 days
1952	19 days
1953	17 days
1954	10 days
1955	10 days
1956	15 days
1957	16 days
1958	12 days
1959	12 days
1960	12 days
1961	25 days
1962	13 days
1963	16 days
1964	13 days
1965	15 days
1966	13 days
1967	13 days
1968	18 days
1969	14 days
1970	20 days
1971	17 days
1972	14 days
1973	13 days
1974	12 days
1975	8 days
1976	19 days
1977	8 days
2011	11 days
2012	14 days
2013	14 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

30 years, 1949 to 2013

A day with at least 39.6 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 139.4 mm (5.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Upper Dam: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	39.6 mm (1.6 in)
5 years	51.2 mm (2.0 in)
10 years	62.9 mm (2.5 in)
25 years	84.6 mm (3.3 in)
50 years	107.8 mm (4.2 in)	Longer than the 30 years of record
100 years	139.4 mm (5.5 in)	Longer than the 30 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 30 years of values from 1949 to 2013.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 112.8 mm (4.4 in) in 2011; 96.5 mm (3.8 in) in 1969; 74.2 mm (2.9 in) in 1954.

Download the Data

Data for Upper Dam standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Upper Dam threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Year	Days with data	Share of year	Complete
1971	28	8%	No
1972	30	8%	No
1975	25	7%	No
2011	365	100%	Yes
2012	366	100%	Yes
2013	334	92%	Yes